You aren't reading it correctly. The OP was saying it's not fair unless you compare against an unordered map. The update is referring to an ordered map which is

You aren't reading it correctly. The OP was saying it's not fair unless you compare against an unordered map. The update is referring to an ordered map which is much slower than an unordered. The GO math implementation, which is an unordered map, is still significantly slower than the C++ unordered map.